HD 40091
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba[2] |
| Right ascension | 05h 54m 52.48300s[3] |
| Declination | −39° 57′ 28.2946″[3] |
| Apparent magnitude (V) | 5.54±0.01[4] |
| Characteristics | |
| Spectral type | M0 III[5] |
| U−B color index | +1.85[6] |
| B−V color index | +1.51[6] |
| Variable type | suspected[7] |
| Astrometry | |
| Radial velocity (Rv) | 114±2[8] km/s |
| Proper motion (μ) | RA: −11.977 mas/yr[3] Dec.: +21.203 mas/yr[3] |
| Parallax (π) | 6.5078±0.1112 mas[3] |
| Distance | 501 ± 9 ly (154 ± 3 pc) |
| Absolute magnitude (MV) | −0.4[2] |
| Details | |
| Mass | 1.21[9] M☉ |
| Radius | 52.43[10] R☉ |
| Luminosity | 392[11] L☉ |
| Surface gravity (log g) | 1.31[9] cgs |
| Temperature | 3,969±122[12] K |
| Metallicity [Fe/H] | +0.14[9] dex |
| Other designations | |
| 60 G. Columbae[13], NSV 16734, CD−39°2260, CPD−39°789, FK5 2449, GC 7471, HD 40091, HIP 27955, HR 2082, SAO 196309[14] | |
| Database references | |
| SIMBAD | data |
HD 40091, also known as HR 2082, is a solitary star[15] located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.54,[4] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 501 light years distant.[3] However, it is rapidly receding with a high heliocentric radial velocity of 114 km/s.[8]
This is an evolved red giant with a stellar classification of M0 III.[5] It has 121% the mass of the Sun[9] but has expanded to 52.43 times its girth.[10] It radiates 392 times the luminosity of the Sun[11] from its enlarged photosphere at an effective temperature of 3,969 K,[12] giving it a red hue. HD 40091 is slightly metal enriched, having an iron abundance 38% above solar levels. [9]
HD 40091 is found to vary between 5.64 and 5.68 in the Hipparcos passband, but it is not confirmed to be a variable star. Therefore, it is catalogued in the GCVS as a suspected variable.[7]
